31.4*3.6+43.9*6.4
问题描述：
31.4*3.6+43.9*6.4
答
31.4*3.6+43.9*6.4
=31.4*(1-6.4)+43.9*6.4
=31.4-31.4*6.4+43.9*6.4
=31.4+(43.9-31.4)*6.4
=31.4+12.5*6.4
=31.4+80
=111.4